Add synthetic ledger generation and ingestion test using stellar-core apply-load

[cjonas9]

What

• Adds generate_ledgers_test.go, which contains:
  • a test adapted from Horizon enabling the generation of N synthetic ledgers and fixtures using stellar-core's apply-load command.
  • a test that snapshots a DB's oldest N ledgers, ingests the ledgers from the former test, trims them from the front of the DB, and then ingests the oldest ledgers from the snapshot, restoring it to its pre-test state.

Why

Resolves #711 and will be used to evaluate/load test stellar-rpc's ingestion pipeline.

Known limitations

N/A

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	golang/​github.com/​stellar/​go-stellar-sdk@​v0.5.1-0.20260506155819-2cb812f76484
	golang/​github.com/​stretchr/​testify@​v1.9.0 ⏵ v1.10.0	+1
	golang/​golang.org/​x/​mod@​v0.17.0 ⏵ v0.29.0	+1

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